Spark-plug



G. cHmsERN. I SPARK PLUG.

APPLICATION -FILED: JAN.2I. |920.

Patented Dec. 20, 1921.

,4 2111 www@ A UNITED STATES PATENT OFFICE.

GROVER CHRISTERN, OF NEW YORK, N.

Y., ASSIGNOR T0 EUREKA SPARK PLUG CORPORATION, OF NEW YORK, N. Y., CORPORATION OF NEW YORK. "9 i SPARK-PLUG.

Specification of Letters Patent.

Patented Dec. 20, 1921.

Application led January 21, 1920. Serial No. 353,074.

To all whom t may concern.'

Be it known that I, GnovnR CHRrsTERN, a citizen of the United States, and a resident of the city of New York, county of Bronx, and State of New York, have invented a new and usei'ul Improvement in Spark-Plugs, of which the following is a specification.

The object of my invention is to provide a simple form of spark plug which is reliable and will not get out of order and which may be readily cleaned without removal and while in position in the engine. This object is accomplished by my invention, one embodiment of which is hereinafter more particularly set forth.

For a more particular description of my invention, reference is to be had to the accompanying drawings, forming a part hereof, in which- Figure 1 is a longitudinal view of my improved spark plug.

Fig. 2 is a top plan view of the same.

Fig. 3 is a bottom plan view of the same.

Fig. 4 is a sectional view, taken on the line 4--4 of F ig. 1, looking in the direction of the arrows. Y

Throughout the various views of the drawings, similar reference characters designate similar parts.

My improvedk spark plug 1 is provided with the usual metallic bushing 2 which may be secured in a cylinder head of an engine in the conventional manner, and it also has a porcelain or other insulating tube 3 which is mounted in the metallic bushing 1n the conventional manner.

The insulating member 3 is provided with a metallic core 4 which passes through its center and is provided with a flange 5 at its base which has a conical recess at its lower end, for a purpose that will appear below, and above this and against the porcelain 3 there is a flange 6 which surrounds a packing 7 which may be of'any suitable kind. This packing is held in place by means of a washer 8 of peculiar construction which rests on top of the insulator 3 and under a. nut 9. The washer 8 has an; off-set shank 10 which extends through a recess 11 in the top of the insulator so that it cannot turn about the sleeve 4 and on this offset portion 10 is placed a binding post 12 to which a wire may be attached which connects the spark plug with any suitable source of electricity for the purposes of ignition. The washer 8 also has a laterally extending end 13 which is perforated so as to receive a projection 14 on a cap 15 which is fixed to stem 16 and theinterior of this cap 15 is separated from the core 4 and nut 9 by a` suitable coil spring-17 which rests about the shaft 16. The lower end of the shaft 16 has fixed thereto an electrode disk 18 with a boss 19 which lits the conical seat in the liange or base 5. This boss fits the recess provided for it with a tapering lit so that when an explosion occurs in the engine, the pressure on the disk 18 will force the boss to fit its seat with a gas tight joint and all leakage from the engine through the spark plug is prevented. This disk also has a recess 20 which normally rests opposite a cleaning projection 21 which is placed in the bottom oi' the metallic bushing 2. The recess 20 and the projection 21 are placed 180 degrees from the projection 14 for a purpose that will appear below. Surrounding about 27() degrees of the disk 18 is a wire yoke 22 which is placed, as shown, and this wire yoke is fixed in the metallic bushing 2 so as to form an electrode of the spark plug. For cleaning the electrode 22, the disk 18 is provided with a projection 23 which is adapted to be moved so as to scrape this electrode 22 and clean all carbon off the same when the disk 18 is turned. The projection 21 projects far enough toward the disk 18 to engage the same when clear of the recess 20 so that by turning the cap 15 it is possible to separate the projection 14 from the ear 13 and then the disk 18 is engaged by the projection 21 and the electrode 22 by the projection 23, and these projections clear the parts with which they engage, of any carbon that may have been deposited thereon. Once the cleaning has been effected, the ear 13 is again engaged by the projection 14, as above set forth, and the spark plug is again ready for further use. It will be noted that this cleaning occurs without in any way changing the electrical connections, although, obviously, this cleaning must be done when the spark plug is not energized as there would be a short circuit at two points should it be cleaned while the spark plug is energized.

While I have shown and described one embodiment of my invention, it is obvious within the scope Aof theanneked claims.

Having thus described my invention,

Iclaim is:

l; A spar forming' an electrode and means for supporting the saine belov.7 said core, ay surrounding electrode seeuredto the'busning, a projectionvonl the disk and a'projection on the bushing' which is enge ged thereby anc means for 'turning tlie disk whereby tlie projections maybe engaged or disengaged, asd'esiied.V

i 2. A spark plug having a boss, an insulator in the bushing, a 'rotating electrode mounted in the insulator, a Washer held against angularv movement at the top of the -insulator,a carp adapted to engage the Washer,v

plug provided with a bushing, an insulating core in said bushing', a disk f a" shaft-connecting the cap and rotating electrode and means on the Washer and cap for holding the electrode in a definite and predetermined Acondition for operation,v ar

liked electrode secured toV the bushing vand means for cleaningrthe electrodes Wlienthe movable electrode is turned.3 l

A spark plug provided Witharbusliing, Y an insulator Vmounted in said bushing, a

core extending through said insulation, a Washer fixedly mounted at tlietop Yof said core and on said insulation, means on said Washer `for connecting it to a source of electrical supply, a disk mountedat the lower end of tlie core, a shaft passing tlirougli the core liked to the disk, a cap liked to the Vother end of the shaft and a spring for keep- Vine the disk .against the cere.

Guovna eHaisTEeN. i Y 

